Self-imaging waveguide optical polarization or wavelength splitt

Details Self-imaging waveguide optical polarization or wavelength splitt Self-imaging waveguide optical polarization or wavelength splitt

1997-01-10

1998-11-17

Sanghaui, Hemang

Optical waveguides

Polarization without modulation

385 29, 385 39, 359489, 359494, G02B 600

Patent

active

058388427

ABSTRACT:
Two new techniques for the separation of orthogonally polarized light or ht of 2 arbitrary wavelengths by use of a waveguide optical device, based on either 1) simultaneous crossed and barred 1-by-1 off-center self-imaging, or 2) out-of-phase self-imaging. Simultaneous crossed and barred 1-by-1 off-center self-imaging utilizes a waveguide optical polarization splitter having an input waveguide containing TE and TM, a multimode interference region, aligned so that TE and TM refractive indices are very different, and with the length set so that the polarization with the lower refractive index is bar self-imaged while the other polarization is cross self-imaged, an output waveguide containing polarization with higher refractive index, and another output waveguide containing the other polarization. Both of these methods may also be used to separate light of 2 arbitrary wavelengths. Out-of-phase self-imaging utilizes a waveguide optical polarization splitter having an input waveguide containing TE and TM, a 1-by-2 polarization-independent self-imaging power splitter, an intermediate waveguide of length L.sub.par containing TE and TM, an intermediate waveguide of length L.sub.par +2*L.sub.perp containing TE and TM, a 2-by-2 self-imaging coupler, and output waveguide containing TE only, and an output waveguide containing TM only.

REFERENCES:
patent: 5379354 (1995-01-01), Jenkins
patent: 5640474 (1997-06-01), Tayag
patent: 5689597 (1997-11-01), Besse

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